My one is new for two months only but already change one star, now only have one star spare.
Avent said that may be I pump too fast that cost the star need to change.
Now I need to send them HKD50 for a 漏斗 otherwise 唔可以係公司pump奶.because粒星成日走出來同會落佐d奶度, 好痳煩.